Badshah answered 5 years ago The main advantage of using the star delta starter is reduction of current during the starting of the motor.Starting current is reduced to 3-4 times Of current of Direct online starting. Hence the starting current is reduced , the voltage drops during the starting of motor in systems are reduced.
reetu answered 5 years ago 1. The main advantage of using the star delta starter is
reduction of current during the starting of the
motor.Starting current is reduced to 3-4 times Of current
of Direcr online starting.
2. Hence the starting current is reduced , the voltage
drops during the starting of motor in systems are reduced.
Fateh answered 5 years ago At the time of starting an Induction motor tends to draw high-current (7to8 times higher than rated current ) . In small motors (<5hp) it’s okay. But for larger motor the starting current may be so high that it may damage the stator coil or even the power cables.
Star-Delta starter is used to reduce the starting current . Initially the motor windings are connected in star pattern. Then after a preset time the contactors make a delta pattern and the motor runs. While connected in star pattern, voltage across the stator coils is equal to the phase voltage (line voltage /1.3 aprox), so the value of starting current is reduced.